<nz-radio-group [(ngModel)]="radioValue">
  <div nz-radio-button [nzValue]="'a'">Hangzhou</div>
  <div nz-radio-button [nzValue]="'b'">Shanghai</div>
  <div nz-radio-button [nzValue]="'c'">Beijing</div>
  <div nz-radio-button [nzValue]="'d'">Chengdu</div>
</nz-radio-group>
